Airfoil Data
NPLX

The NPL AIRFOIL FROM ARC CP 1372 is a thin 4.9% chord-thickness airfoil with a maximum camber of 2.5% at 45% chord, suited to high-speed UAVs, sailplane tip sections, and propeller blade design. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -2.5°.

Thin airfoil theory predicts a stall angle near 12.0° and a peak lift-to-drag ratio around 49 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The slim profile minimises pressure drag at higher speeds but leaves limited spar depth for structural integration.

Designers evaluating the NPLX typically compare it against profiles of similar thickness: HAM-STD HS1-404 AIRFOIL, NACA 1408, NPL 9510 AIRFOIL, HQ 1.0/8 AIRFOIL, RYAN BQM-34 FIREBEE WING AIRFOIL. The AH 79-100 A AIRFOIL is another reference profile frequently considered alongside it.